template "widget[@type='ForEach']", mode="widget_defs" {
    param "hmi_element";
    const "widgets", "func:refered_elements($forEach_widgets)[not(@id = $forEach_widgets_ids)]";

    const "class","arg[1]/@value";

    const "base_path","path/@value";
    const "hmi_index_base", "$indexed_hmitree/*[@hmipath = $base_path]";
    const "hmi_tree_base", "$hmitree/descendant-or-self::*[@path = $hmi_index_base/@path]";
    const "hmi_tree_items", "$hmi_tree_base/*[@class = $class]";
    const "hmi_index_items", "$indexed_hmitree/*[@path = $hmi_tree_items/@path]"; 
    const "items_paths", "$hmi_index_items/@hmipath"; 
    |     index_pool: [
    foreach "$hmi_index_items" {
    |       «@index»`if "position()!=last()" > ,`
    }
    |     ],
    |     buttons: [
    const "prefix","concat($class,':')";
    const "buttons_regex","concat('^',$prefix,'[+\-][0-9]+')";
    foreach "$hmi_element/*[regexp:test(@inkscape:label, $buttons_regex)]" {
    |         ["«substring-after(@inkscape:label, concat(arg[1]/@value, ':'))»", id("«@id»")]`if "position()!=last()" > ,`
    }
    |     ],
    |     init: function() {
    |         /* TODO elt.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_click(evt)");*/
    |     },

    |     items: [
    const "items_regex","concat('^',$prefix,'[0-9]+')";
    const "unordered_items","$hmi_element//*[regexp:test(@inkscape:label, $items_regex)]";
    foreach "$unordered_items" {
        const "elt_label","concat($prefix, string(position()))"; 
        const "elt","$unordered_items[@inkscape:label = $elt_label]";
        const "pos","position()";
        const "item_path", "$items_paths[$pos]";
    |       [ /* item="«$elt_label»" path="«$item_path»" */
        if "count($elt)=0" error > Missing item labeled «$elt_label» in ForEach widget «$hmi_element/@id»
        foreach "func:refered_elements($elt)[@id = $hmi_elements/@id][not(@id = $elt/@id)]" {
            if "not(func:is_descendant_path(func:widget(@id)/path/@value, $item_path))"
                error > Widget id="«@id»" label="«@inkscape:label»" is having wrong path. Accroding to ForEach widget ancestor id="«$hmi_element/@id»", path should be descendant of «$item_path».
    |         hmi_widgets["«@id»"]`if "position()!=last()" > ,`
        }
    |       ]`if "position()!=last()" > ,`
    }
    |     ],
}

template "widget[@type='ForEach']", mode="widget_subscribe"{
    // param "hmi_element";
    |     sub: function(off){
    |         /*subscribe.call(this,off);*/
        /* TODO */
    |     },

    |     unsub: function(){
    |         /*unsubscribe.call(this);*/
        /* TODO */
    |     },
}